package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c=new ArrayList();
        //Collection c=new HashSet();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));

        System.out.println(c);

        Point p=new Point(1,2);

        boolean contains=c.contains(p);//受equals影响
        System.out.println("是否包含："+contains);

        c.remove(p);//受equals影响，先删除首个相同的元素
        System.out.println(c);
    }
}
